yeah guys, not all of the parts, both standard and option, are listed yet. I know a lot of guys are looking for the servo horns and spurs (Myself included). I've been told you can fit up to a 34 tooth pinion with the kit spur. In order to get the recommended starting gearing, you would run either a 29 or 30, so you can see you'll still have a lot of room to adjust.
Personally I plan on just building an entire 2nd center diff with the 70t spur when it comes in stock.
Also I believe the Ruddog YZ2 servo horn works. It's not exact, but it's close.